Drilling machine



Feb. 14, 1928.

G. H. GILMAN -DRILLING MACHINE 2 Sheets-Sheet Original Filed May 23, 1921 2 Sheets-'Sheet 7196,11. wJZma/nf. y L7M f M,

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uw* mmm Original Filed May 23. 1921 Vic@ im ec 3U n fiud pressa@ opelif @essaye @perated power cym dem and 1 e 1 Whmh may.

his iston mimecte tu the drill stad actua im v y meeuw nmmxg a piston rod cnmpsmins th@ inner wb@ 2K. is uszmi'ed ich v rod is comxece, to ih@ actuazmf by means oomprang a membm 2"/ kwin@ the @m pov tiem 29 of remced damem which enter@ the and the mb@ 23 md forms im ex Jcefm shquer 31 which the :and mf dla mba Euh@ and mmber 2'2" bsng secure@ in this 'felation in any suitabe mmf o1? the membe' 2*? is shown cfm @med gorium lim chill am, czuawr, said pojecu als@ serving as a Valve casing Ew th@ @mi Y@ ing wlw@ 35 im L s ctuiawr., For o @ze cmmecan the plojccn ig Y" @is pmvled with ewfwwy nipple 37 having immo-coma@ fr fend 39 and an intermediate gfova Huid supply by Way of ik@ hose connection This connecmn ccmanty supplies mw Uve mz to the interm coudur 5'3" ci' the .mve and to the adia passage, 59 p-acng' said comlt in communication with the eX- eru surface of th Valvet By manpulaz ing he valve handle? he rafal passagefmay be .moved im@ andi out of cmmuncatan with H1@ na passage (il 0f the .drill steel acuator to supply it Wh motiv@ u mf to ntelmpt such suppy.

Heem ih@ member 27 ntemfdaim length is s0 forme@ as: to provide L mh@ sa@ 63 im' dw Vavfe which "commis the @mv-@mem Gf ik@ fee@ psom This valve is si Lw *msho-conca *turning pug uype and mmay held m its seat by .means of shudder 6'@ o the valve mii @im @am @9 eos ing @ha @and of ih@ miv@ Th@ miv@ eri may be operated by means ot o handle 71. Herein, for supplying the velve with motive duid the upper end of the valve casing es viewed in Fig. 3 is connected by e passage with the interior of the soolreted end '73 of the member 27, and 'for connecting the socket-with the source of motive fluid supply the nipple 37 is shown es formed with a passo e 77 communicating with tbe socket end wit a groove 79 formed in the interior Well ot .the valve casing 33, the groove 79 bein interseeted by o longitudinal groove 81 W ich is orrned in the Well of the vulve easing end terminates odjecent tbe bose connection. y

ln the member 27 on tbe side of the valve 65- opposite tbe socket 73 is shown u oir or passages 33 und 85, the 'toriner estab isliing communication between the interior oit 'die tube 23 und 'the seat for tbe valve 65 and tbe letter between the tube 25 end said seat. For establishing the connection between the tube 25 and 'tbe passage 85, the end ol tbe vpassage is `provided with un enlarged diemeter portion 37 which receives tbe tube and to 'Wliiob it is Welded.

Herein tbe Atube 23 is 'formed to present the straight portions 89 and 91 connected by the bend torrning e. transverse portion 93, the straight portion 91 entering tbe interior oil 'tbelee cylinder through tbe peroretion 95 in the reel' feed cylinder bend. ln the cylinder tbe end of tbe tube is secured preferably by Welding to the reduced diameter portion 97 of the tubular member 99. The reduced diameter portion 9'? torres a shoulder egoinst which tbe end of tbe 'tube sbuts, und against tbe shoulder formed by the end of the tube sbuts one ol tbe sections 101 ol tiie'piston, tliese sections being lield in assembled relation by ineens oi" tlie .nut 103 oooperotin with tbe sorevv-tl1readed end ont the inem er Q9. The bore 105 ovl the member 99 is in free eoniniunieotion Witb tbe interior of tbe tube 23, tbis bore being' rduced in diameter, 1however, at the rearward end ol tbeinember to form a bore 107 rvliieli receives sind olosed by 'the tube 25, the interior ont tbe lutter opening to the forward side ot tl'ie piston.

1n assembling the piston rod the member 99 is iirst secured to tbe outer piston rod tubo 23 and tbe inner piston rod tube to ille member 27. The tube 25 is then threaded through the tube 23 until its end posses through ltbe bore 107. The end ot tbe tube 23 is tlien expended to 'torni tbe flange 109 fitting the dared end 111 oi 'the bore 10'?. To enable tbe 'tube 25 to be readily threaded tlirouoli tbe tube 23, tbe former preferably is Horrible. llerein tbe tube is iorned veit." eonvolutions 113 which produce o tint coil at tbe portion ol" tbe tube fitting tbe bend in the tube 23. 'llie coiled portion ot1 the `tube when threaded through the bend 'will weones engage the Wells el the tube 23 and thereby bold the inner tube against vibration and et the seme time enables the inner tube to be placed under tension to bold the flange 109 lirinly against its seat provided by tbe tiered portion 111.

As illustrated, for controlling the operation of tbe feeding device, the valve G5 is provided with an internal conduit 115 which communicates with the rearward end of the valve casingand thereby provides that seid conduit is in constant communication with the source of motive fluid supply. Referring particularly `to Figs. 3 and 5, in the plone of the passage 83 leading Ato the interior ot the outer piston rod tube tbe valve is shown es formed with tbe rudiei passages 117 and 119 iviiicll piece tbe conduit 115 in-ooinmunioution with tbe exterior of tbe valve. ln the seine plone as tbe passage 85 leodinfr to tbe tube 25 l provide a similar redizd passage 121. Adjacent opposite ends ol tbe velve are arcuate grooves 123v und 125, und for placing them in communication with tbe atmosphere ore Vbe passages 12T and 129 termed in tbe valve casing'. The groove 125 is in constant communication with the passage 129 and tbe groove 123 intcrinittentiy in communication with tbe passage 12"( as 'will iiereinotter eppeer. Lending it'roin tliese grooves toward the center of tbe valve ere respectively grooves 131 und 133 :termed on tbe exterior oi tbe vulve ond respectively terminating in plunes including' tbe sdjoeent portions oi tbe passages 83 und E35. it opposite sides of the pass-ege 119 und in conimuniestion tberevvitli ere narrow slots 135 und 137, und et one side oi tbe passage 121 o siiniiur slot illu.

,'ilie operution uit' the vulve 35 is os lollovfszm Willi tbe ports in ""llleutrol position indicated in Fig. 5, tbe psssoges 33 sind 35 leed ing 'to opposite ends ot 'tbe ii'eed cylinder are in connnunic-stion ivitli neither tlie source oi motivo tluid nor tbe utniospbere. ll, from this position tbe vulve is turned clockwise to tbe position indicuted by Slow for`- wurd tbe pese-nge 33 will be placed in sono inunicotion .vit-li e slot 137, While the pussege 85 will be pissed more or less depending on tbe eiruot 'position ol" tbe vulve in communication Wit-li tbe lgroove 133. ln tbis position 'tbe volvo supplies u restricted amount' of motive fluid to tbe rear end ol tbe cylinder ond permits u restricted exhaust 4from the 'liront end o1' `tbe cylinder Aivliieli causes tbe leed piston to slowly -`t'eed tbc drill bit torverds tbe tvorlr. lf trom the Slow liorvvurdW position tbe vulve 'is turned turtlier in n cioolrvviso direction, to tbe Full forward 'position indicated by Fig. ii, the passage 53 is placed in -iull communication with tbe passage 137 und the passage 85 in full communication with the erliuust groove Bil Utl

Uli

133 which causes the piston to torce the drill bit towards the work with a maximum of pressure. lf, from lthe full forward position, the Valve is turned further in a clockwise direction, the slot 135 may be brought into yconnnunication with the passage 83 and the groove 133 moved to partially communicate with the passage 85 `which again restricts the admission to the rear and the exhaust trom the front end ol: 'the cylinder to decrease the force of 'the leed.

lf the valve is moved :from vthe neutral position to the Slow reverse position shown by Fig. 5, the slot 139 is'brought into communication with the passage 85 and the passage 117 into communication with the passage 33.V llhisplaces both ends oit the cylinder in communication with the source of motive fluid supply, 'the supply to the iront end being restricted and in consequence oi this, the piston by dillerential action is torced to slowly mov-e the drill steel awa trom the rock. lt "from the Slow reverse position 'the valve is moved further in an anticloclrwise direction to the llullreverse position indicated by Fig. 5, .the passage 83 will be placed in comn'iunication with the einiaust groove 131 and the passage .85 in communication with the passage 121.1Hfl`his will place the rear end in. coinnun'ication with the atmosphere andtheV front end in full communication with' the motive il'uid supply and in consequence the ldrill-bit will be retracted with a maximum of torce.

As shown for preventingP the-piston from violently strikingT the cylinder heads ot the feed cylinder, the `front cylinder head is provided with apin or other projection 141 which is adapted to enter the interior of the tube 25 when the piston approaches the front end of the cylinder. The diameter lof the pin is slightly less than that of the interior ot the tube in order that it may restrict but not entirely close ott' communication between the interior of the tube and the endy of the cylinder when the piston is at its extreme forward end. Communication between the outer tube ot the piston rod and the rear end of the cylinder is provided by a passage 143 and a restricted passage 145. 1When the piston yapproaches the rearward end of its stroke, the portion of the tube having.;- the passage 143 enters the bore ot the front cylinder head which closes said passage and leaves open only the restricted passage 145. lt will be noted bv these means that l have provided for restricting the exhaust from each cylinder end when the piston approaches the correspondingv cylinder head but have not prevented the admission of tluid to such end for moving the piston away from the cylinder head.

It will be noticed that the cylinder heads and opposite faces oi the piston. provide pairs of pressure abutments of which those adorded by the faces ot the piston are .movable and that the forward :tace of the piston is larg-'cr than the rearward vlac-e to provid-e a differential piston and pairs oit oppositely 'lacing` pressure abutments having relatively different areas. f i

rEhe invention disclosed herein is an improvement on 'the .invention disclosed in my copending application Serial No. 442,0Jt, tiled l1 february 3, 1921.

.although l have described one specific embodiment o'tmy invention ttor purposes of illustration, it ias to be understood that 'wide deviations may be made therefrom without departing :trom lthe spirit oit my invention.

.ly thelength of said rod and bearing against the walls ot said rod at the bend oit said rod, said rod being in fluid communication with one end of said cylinder and said tube with the other end ot said cylinder, and means. for connecting the interior ot said rod and tube with a-source ot' motive fluid.

' Q. ln a machine of the character described, an actuator tor a drilling tool, teoding means for said tool comprisinga cylinder ,and piston, said cylinder slidably car- 'ijvinpsaid actuator', a hollow substantially U-shapcd piston rod having two straight portions and a portion connecting said straight portions, said piston rod projecting through the rear end of said cylinder and connecting.;l said piston and actuator, means providing a tubular fluid conduit located interiorly ot one of said straight portions., means providing a tubular fluid conduit located interiorly of the other straight portion. a conduit in the connecting portion o1 said rod connecting said means, a support for each of said means adjacent the connectin o; portion of the rod,'anda connection to a Source ot' motive fluid fon-admitting motive fluid to one end-ot saidcylinder by way ot' said hollow piston rod and to the other cud of said cylinder by way oi said means and conduit.

, 3. In a machine of the character de-- scribed. a hammer rock drill having provision For carrying' a drilling tool, feedin means ifor said drill comprising a fecdicy inder and piston, aA hollow-piston rod con.,-

nccting said pistou to said drill, the interior llllv of said rod being in fluid communication with said cylinder at one side of said piston, a tube in said hollow rod, said tube being in fluid communication with said cylinder at the opposite Side of said pist-on, means supporting said tube at one end thereof a flange at the opposite end of said tube, means providing a seat for said flange, and means placing said tube under tension for holding said flange to its seat.

Ll. In a machine of the cha `acter described, a hammer rock drill, feeding means for said hammer rock drill comprising a cylinder and piston, said hammer rock drill being slidably supported by said cylinder, a hollenv substantially U-shaped piston rod extending through the rear end of said cylinder and connecting said piston and hammer rock drill, said piston rod being in fluid communication with the rearward end of said cylinder, a longitudinally resilient tube in said hollow rod in fluid communication with the forward end of said c linder, means providing aV flange carried by said tube adjacent one end of said tube, means )roviding a seat for said flange, said tube bearing against the Walls of said rod at the bend of' said U, and means for supporting the end portion of' said tube opposite Said flange.

5. A machine of the character described having, in combination, a percussive tool, feeding means therefor comprising a cylinder and piston, said cylinder slidably supporting said percussive tool, connecting means between said piston and percussive tool comprising a hollow piston rod having a straight and connected transverse conduit for conducting motive fluid to said cylinder at one side of said piston, and a flexible tube inserted in said rod and passing through said conduit for conducting motive fluid to said cylinder at the opposite side of said piston. said tube bearing against the Walls of said transverse conduit.

6. A machine of the character described having, in combination, a percussive tool, feeding means therefor comprising a cylinder and piston, a hollow piston rod connecting said piston with said percussive tool` said rod having a straight and connected transverse conduit, a tube inserted into the conduit of said rod, said tube having a `rigid portion in the straight portion of' said rod, and a flexible portion in the transverse portion of said rod bearing against the Walls ot' said transverse portion.

7. A machine of the character described having, in combination, a percussive tool, feeding meanstherefor comprising a stationary cylinder' and movable piston, said percussive tool being offset relative to said cylinder with their axial lines parallel, a

.bent piston rod connecting said percussive tool and piston, a tube extending through said rod, said tube having a flexible portion for passing it through the bend of' said rod and connections for conducting motive fluid to said cylinder by Way of' said tube.

8. In a machine of the character described, a percussive tool, means for moving said tool relative to the work comprising a cylinder and piston, a hollow substantially U- shaped piston rod extending through the rear end of said cylinder and connecting said piston to said tool, said rod being in fluid communication with one end of' said cylinder, a tube in fluid communication with the other end of said cylinder and located interiorly of' said rod, said tube having a flexible portion passing through the bend of said U- shaped rod and bearing against the walls of said bend.

9. A machine ot' the character described having, in combination, a percussive tool, feeding means therefor comprising a cylinder and piston, said percussive tool being slidably supported in side by side relation with said cylinder, a piston rod formed of a tube bent to a substantially U-shape extending through the rear end of said cylinder and being in huid communication with one end of said cylinder, and a flexible tube carried interiorly of said rod adapted to conform to said bend when inserted and forced through said rod said tube being in fluid communication with the opposite end of said cylinder.

10. A machine of the character described having, in combination, a percussive tool, feeding means therefor comprising a cylinder, a piston in said cylinder', a hollow piston rod secured to said piston and opening through one side thereof, an open ended tube closing the open en'd of said rod from communication with said cylinder, said tube Communicating with said cylinder at said side of said piston, means placing said rod in communication with said cylinder at the opposite side of said piston, and means for connecting said rod and tube to a source ot vmotive fluid.

ing said rod and tube for conducting aetuat` ing fluid from a source of supply to opposite ends of said cylinder.

12. A machine of the character described having, in combination, a percussive tool, feeding means therefor comprising a tubular sleeve carrying a piston and projecting from opposite ends thereof, a hollowY piston rod carried by said sleeve and forming therewith a shoulder, a tube in the hollow of said rod titl titl

Vtiti and carried by said sleeve, said tube closing one end of said sleeve vfrom communication with said cylinder, and a nut on the end of said sleeve holding said piston against said shoulder.

13. A machine of the character described having, 1n combination, a percussive tool, feedlng means thereforcomprlsing a tubular sleeve having a reduced internal diameter` portion, an open ended tube carried by said portion, a piston carried by said-sleeve and having an end face spaced fromv the end of said sleeve to afford a. projecting sleeve portion, and gholhmf iston rod surrounding said tube and carried by. said projecting sleeve portion.

1li. In a` machine of the characterl described, a percussive tool, fluid operated feeding means for said percussive tool comprising a stationary cylinder', a piston in said cylinder, a substantially U-shapcd hollow piston rod one leg of which extends from the rearward end of said cylinder and is connected to said piston, the other le being connected to a valve casing carried y said percussive tool, said percussive tool being slidably supported by said feed cylinder by means independent of saidrod, and a valve in said valve casing controllingr the admission of motive fluid to said cylinder by Way ot' said hollow rod for actuation of said piston.

15. ln a .machine of the character described, a. drill operating device, a guide for said device, fluid operated feeding means for moving said device along said ide, said feeding means comprising a stationary cylinder member and a movable piston member, a hollow substantially U-shaped piston rod projectim; through the rear end of said cylinder and being in duid communication therewith, means independent of said rod for connecting said device to said guide, a valve casing connecting the end of said rod to the rearward end of said device, and a valve carried by saidV casing for controlling the admission and exhaust of motive duid to and from said rod for actuation of said piston.

16. ln a machine' of the character described, a drill operating device, a guide for said device, fluid operated feeding means for moving said device along said guide, said feeding means comprising a stationary cylinder member and a piston member, a hollow substantially ltl-shaped piston rod projecting through the rear end of said cylinder and being in fluid communication therewith, a tube in said rod extending substantially the full length thereof, said tube being in duid communication with the opposite end of said cylinder, a connection between said rod and the rearward end of said device, and a valve carried by said connection for controlling the admission and exhaust of motive duid to said rod and tube for actuation of said piston. v M

17. In a machine of the character described, a fluid operated-tool actuator, a Valve casing having a valve carried by said actuator for controllingthe latter, a casing for said valve, Huid operatedA means for feeding 'for carrying a drill steel, a feed cylinder containing a feed piston, a tube in kduid communication with said cylinder at one side of said piston, 4said tube having a bend and connecting said tool to said piston, said cylinder supporting said tool independently of said tube, a second tube, the'latter being in fluid communication with said cylinder at the opposite side of said piston andV carried interiorly of said first mentioned tube in contact with the Wall thereof at said bend.

19. A rock drill having, in combination, a hammer drill comprising a casing having provision for carrying a forwardly rejecting drill steel, a feed cylinder, a fee piston, means formin a feed piston rod, nmeans other than said rod for operatively slidably connecting said casing and cylinder in side by side relation, said means forming said rod having a portion project-ing into the rear end of said cylinder and having a return portion spaced from the first mentioned portion, said return portion bein operatively connected to. said casing and eing1 adapted to lie 4at the same side of said cylinder as said casing, and means for controlling the feeding of said hammer drill comprising a pairof motive duid conducting conduits in that portion of said means forming said rod which projects into said cylinder, said conduits bein respectively in communication with said cy inder at opposite sides of said piston.

20. A roclr drill having, in combination, a hammerdrill comprising a casing having provision for carrying a forwardly projecting drill steel, a feed cylinder, afeed piston, a feed piston rod having a substantially U- shapc, one leg of said-U projecting into the rear end of saidcylinder and being connected to said piston, the other leg ot said ti be-l ing operatively connected tosaid drill and being adapted to lie at the same side of said cylinder as said drill, means other than said rod for operatively slidably connecting said llO cylinder and drill in side by side relation, and means for controlling the feeding of said drill comprising a pair of motive fluid conducting conduits formed in that leg of said rod which projects into said cylinder, said conduits respectively communicating with said cylinder at opposite sides of said piston.

21. A drilling machine having,in combination, a feed cylinder and a percussive tool slidably and nonrotatably connected in side by side relation for relative longitudinal movement, means providing a feed piston* maaien ton, means for admitting motive fluid to said hollow portion and said tube for electing actuation of said feed piston.

22. A rock drill having, 1n combination, a percussivetool having revision for carrying a forwardly projecting drill steel, feeding means for said tool comprising a feed cylinder and means providing a feed iston and feed piston rod, said rod beine' su stantially in the form of a U-shaped tu ie having one leg projectinfr into the rearward end of said cylinder and the other leg operatively connected to said tool, passage means placing the interior ol' said rod in fluid communication with said cylinder at one side of said piston, a' tube in said rod in fiuid communication with said cylinder at the opposite side of said piston, means for supplying motive fluid to said tube and rod for effecting actuation of said feeding means, and means independent of said rod for slidably connecting said cylinder and tool.

GEORGE H. GILMAN. 

